Goldwood GW-204/8S 4" Shielded Poly Woofer 8 Ohm
Best box: 3.0 L bass reflex tuned to 69.8 Hz · F3 131.5 Hz
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Comparable 4.0" Drivers
Drivers with similar piston area, resonance and Qts — useful alternatives when the Goldwood GW-204/8S 4" Shielded Poly Woofer 8 Ohm does not fit your target box volume or tuning. Each entry links to its full enclosure design and Thiele/Small parameters.
⚠️ Engineering Notice for Builders
- The textbook alignment (1.5 L at 116.4 Hz) would need a 25.4 cm port; the recommendation is retuned to 3.0 L at 69.8 Hz so the port can be built.
- Limited linear excursion (Xmax: 1.5 mm); set a high-pass subsonic filter at 25–30 Hz when driven with high power.
Recommended Bass Reflex (Vented)
PORT BUILDABLE| Net Box Volume (Vb) | 3.0 Liters |
| Tuning Frequency (Fb) | 69.8 Hz |
| F3 (-3 dB Cutoff) | 131.5 Hz |
| F6 / F10 Extension | 112.9 Hz / 57.3 Hz |
| Port Inner Diameter | Ø 5.0 cm |
| Port Physical Length | 36.7 cm |
| First Pipe Resonance | 469.0 Hz |
| Estimated MOL @ F3 | 97.1 dB SPL |
Sealed (Acoustic Suspension) — compromise
SUITS INFINITE / OPEN BAFFLEWith Qts 1.56 a Butterworth (Qtc 0.707) box would be many times Vas. A box equal to Vas reaches Qtc 2.206; for a flat response this driver is better used on an infinite (IB) or open baffle.
| Net Box Volume (Vb) | 1.1 Liters |
| System Q (Qtc) | 2.206 (above Butterworth: Qtc cannot fall below Qts (1.56)) |
| System Resonance (Fc) | 193.6 Hz |
| F3 (-3 dB Cutoff) | 161.4 Hz |
| F6 / F10 Extension | 144.0 Hz / 123.7 Hz |
| Air Spring Linearity | High (Zero port compression) |
Thiele/Small Parameters
| Resonance (Fs) | 136.9 Hz |
| Total Q (Qts) | 1.56 |
| Electrical Q (Qes) | 2.023 |
| Mechanical Q (Qms) | 6.82 |
| Equivalent Volume (Vas) | 1.1 Liters |
| Diaphragm Area (Sd) | 53.5 cm² |
| DC Resistance (Re) | 7.3 Ω |
| Efficiency Bandwidth Product (EBP) | 67.7 |
| Linear Excursion (Xmax) | 1.5 mm |
| Thermal Power (Pe) | 40.0 W |
| Nominal Diameter | 4.0" |
| Catalog Source | Load Forge catalog (manufacturer datasheets and retailer listings) |
Frequently Asked Questions
What is the recommended ported (bass reflex) box volume for Goldwood GW-204/8S 4" Shielded Poly Woofer 8 Ohm?
Load Forge's calculated alignment puts Goldwood GW-204/8S 4" Shielded Poly Woofer 8 Ohm in a 3.0 liter vented enclosure tuned to 69.8 Hz, reaching an F3 cutoff of approximately 131.5 Hz.
Can Goldwood GW-204/8S 4" Shielded Poly Woofer 8 Ohm be used in a sealed box?
Yes. In a sealed (acoustic suspension) enclosure of 1.1 liters with a Qtc of 2.206 (above Butterworth: Qtc cannot fall below Qts (1.56)), the system exhibits an F3 of 161.4 Hz.
What port dimensions should be used for Goldwood GW-204/8S 4" Shielded Poly Woofer 8 Ohm to avoid port chuffing?
Sized from cone displacement (Sd × Xmax), a minimum port diameter of 5.0 cm with a length of 36.7 cm is suggested; check the port air velocity at your drive level in the Load Forge Studio.
Shareable Acoustic Card for Forums & Social Media
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